Most oem parts (except processors) come with the exact same warranty as their retail counterpart.
They also come with the manaul and cd (just not necessarily some extras like games and stuff).
OEM parts are bulk packed, to save on packaging. If you get an oem product without the cd or...
depends on the chipset,
if it has an 815 chipset, it should, but may need a bios flash
check with the manufacturer, they should be able to tell you the
gigabyte ga-5ax mainboard with the amd k6/2 -400 chip, that was the shiznit
The 4 mb Diamond viper pro was also kick ass, and the best card you could buy at the time....
you could always go with a 120gb maxtor or larger, then partition it
i'd get a gig of ram, just for longevity. look at corsair, but the mushkin level 2 is performing better